It may be said that the existence of the angels and spirit beings is as definite as that of human beings and animals. Indeed, as is explained in the First Step of the Fifteenth Word, reality undoubtedly requires and wisdom certainly demands that like the earth the heavens have inhabitants, and that its inhabitants are intelligent, and suitable for the heavens. In the tongue of the Shari’a, those inhabitants, of which there are numerous kinds, are called angels and spirit beings.